Improvement in reverberatory furnaces



ELLICOTT- & MCCRONE.

Reverberatn-g Furnace.

No. 4,515. Patented May 16, 1846.

Unire Sierre Armar OFFICE.

A. ELLIOOTT AND J. MUCRONE, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN FEEVEFlBlZ-IRATORYv FURNACES.

Specification forming part of Letters Patent No. dated May l0, 1846.

.To all whom, it may concern,.-

Be it known that we, ANDREW ELLIcorr and JOHN MOCRONE, of the city ofBaltimore, in the State of Maryland, have made a new and usefulimprovement in the manner of arranging and combining two reverberatoryfurnaces and a single fire-chamber, to be u'sed in the manufacture ofiron and for other purposes, which combined furnace we denominate thedouble hot-blast reversing furnace, and We do hereby declare that thefollowing is a full and exact description thereof.

In our manner of combining two reverberatory furnaces with a singlefire-chamber, the two reverberatory chambers are placed side by sidewith a division-wall between them. Each of these chambers has itsappropriate chimney, these chimneys running up together in one stackwith a division-wall between them, and each being furnished with ashutter or damper, allowing one of them to be closed when the other isopen, or both to be open together, as may be required. The fire-chamberextends along the front of both the reverberating chambers, and when theheated air is blown into the closed ash-pit, andthe dampers on both thechimneys are open, the heating of the metal contained within thereverberating chambers will take place in each of them equally, thequantity of heated air blown in being the same as would be blown intothe two furnaces were they separated from each other. The air is heatedin recurved tubes contained within the respective chimneys, and isconducted into the ash-pit below the grate-bars in the ordinary manner.lBy this combination of two reverberating chambers with one firechamberthe difliculty which has been heretofore experienced in bringing theiron or other material which is being operated upon up to the ultimateheat required, and which often occasions a great waste of time andmaterial, is entirely obviated. During the general process of heating,the dampers on both the chimneys are left open, and the operationproceeds equally in each furnace, but when the ultimate Y heat is t0 beobtained in one of them the damper of the chimney appertaining to theother is to `in the course of a very few minutes, attain the l ultimateheat required. During the short period in which this is taking place,that contained in the opposite chamber will not have su'ered anysensible diminution of temperature, and by turning the whole force ofthe blast upon this in the like manner the same end willbe attained.rhis manner of combining and arranging the two furnaces constitutes ourfirst improvement.

Our second improvement consists in the manner in which we combine thehollow gratebars of the fire-chamber with a hollow trunk at their innerends, into which hollow trunk cold air is to be blown, which, passingthrough the hollow grate-bars, will itself become heated, thusprotecting the bars from being burned out, and adding to the quantity ofheated air which is forced intothe ash-pit..

Ve are aware that cold air has been forced through hollow grate-bars forthe purpose of protecting them from being burned out, and we do notintend, therefore, to claim this as in itself new; but in the methodsheretofore adopted the hollow bars have been connected with the cold-airtrunk in a complex manner by means of screws or other analogous devices,and they have consequently been very liable to be out of order, and havewith difficulty been removed and replaced.- In our manner of arrangingthem this difficulty is entirely obviated, as they are merely droppedinto place like the common bars of an ordinary furnace.

In the accompanying drawings, Figure l is a perspective view of ourcombined furnaces, the arch being removed from the fire-chamber and fromone of the reverberating chambers,

2 is a front elevation of the fire-chamber, and Fig. 3 a representationof the manner of form- -ing and arranging the grate-bars and the trunkor tube by which they are supplied with air.

A A is the interior of one of the reverberating chambers; B B, the archof the corre sponding chamber, and C C the fire-chamber without itsarch.

D is the chimney-stack, containing the separate flues or chimneys of therespective chambers.

E E are the dampers on said iiues.

G is one of the holes through which cold air is to be forced into therecurved pipes contained in the chimney, and H H the pipe by which forthe purpose of showing the interior. Fig.

the hot-blast is to be conveyed into the ash-pit of the hre-chamber.There is a like apparatus on the other side of the combined furnaces.

- lis the space below the arch B, through which the heated air passesinto the reverberating chamber. The openings for the supply of fuel, forballing, or for other operations to be performed in the furnace aresimilar to those in common use.

From what has been already said of the design of this manner ofconstructing the cornbined furnaces and single fire-chamber, its Wholeuse and the manner of applying it will be perfectly understood.

J is a blow hole or opening leading into the hollow trunk or tube,through which the cold air is to enter the hollow grate-bars. This trunkor tube with some of the grate-bars placed thereon is shown in Fig. 3.

K K is the trunk, and'L L the gratebars. The trunk is shown as madesquare; but this is not absolutely necessary, as it maybe round 0rotherwise, if preferred. This trunk is shown as having one of its anglesremoved at a a, along that part on which the rear ends of the hollowgrate-bars are to rest. The ends of these bars are made square, and theyare simply dropped into their places sideby side, so as to fill thewhole space in the trunk J that has been out away to receive them. Itwill be seen that under this arrangement they may be removed andreplaced with the utmost facility, and that they are as little liable toinjury as they can in any way be made.

Having thus fully described the manner in which we construct our doublehot-blast reversing furnace and shown the design and operation thereof',what we claim therein as new, and desire to secure by Letters Patent, 1s

l. The manner herein made known of combining two reverberating chamberswith a single fire-chamber under an arrangement by which we are enabled,when necessary, to direct the whole of the double blast into either ofthe reverberating chambers at pleasure, for the purpose set forth.

2. The particular manner inwhich we form, arrange, and apply the hollowgrate-bars, and the trunk or tubethrough which they are supplied withcold air, by which arrangement all that is necessary to insure theirproper action is simply the dropping them in place side by side, asherein made known.

ANDV. ELLICOTT. JOHN MCGRON E.

Witnesses:

J No. SHAMAERs, HENRY WM. ELLIoo'rr.

